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Amplitude sweeps of A4H3B4H3-containing hydrogels in PIPPS buffer. Amplitude sweeps were performed at a constant angular frequency of 10 rad s−1, changing the strain amplitude from 0.1% to 1000% and vice versa. (A) In the absence of metal ions; (B) in the presence of 1:1 Ca2+:His; (C) 1:1 Zn2+:His; (D) or 1:1 Zn2+:His + 25 mM EDTA (4× excess with respect to the His concentration).
